Nut-lock.



"No. 739.716. BATENYTED SEPT. 22, 1903.

M. REID. NUT LOGK.

APP LIOATIOKIILED SEPT. 6, 1902.

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Ili'atented September 22, 1905.

MAucnLLus REID,.OE PROVIDENCE, RHODE ISLAND, ASSIGNOR, BY DIRECT- ANDMESNE ASSIGNMENTS, TO HIMSELF, TRUSTEE.

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. s'rncrnrcnrrou forming part of Letterman No. 739,716, dated September22', 1903. Application filed se amta '6, 1902. Serial in. 122,889. (Nomodel.)

To all whom) it may concern.-

M Be it known that I, MARCELLUS Rain, of

Providence, in the county of Providence and State of Rhode Island, haveinvented certain new and useful Improvements in Nut-Locks,

of which the following is a specification.

This invention relates to nut-locks; and it consists in certain novelfeatures of construction the arrangement of which I will now pro ceed todescribe and claim. I

Of the accompanying drawings, Figure 1 represents a longitudinalsectional view of a nut-lock'constructed in accordance with myinvention. Fig. 2 represents asection on the line 2 2 of Fig. 1. Fig. 3represents a rear elevation of the outer nut. Fig. 4 represents anelevation of the locking-washer. Fig. 5

represents a section on the line 5 5 of Fig. 1

with the parts in a difierent relative position from Fig. 1.

The same reference characters represent the same parts in all thefigures.

Referring to the drawings, 10 is a shaft, arbor, or support formed withan inner screwthread 11 and an outer screw-thread 12 of smaller diameterand opposite pitch. Upon the respective threaded portions are mountedinner and outer nuts 13 14, of which the outer nut 14: may be considereda jam-nut, which upon being Screwed against the nut 13 looks the latteragainst movement. The inner nut '13 is formed with an annularcircumferential groove 15, which is placed'sufficiently near to theouter face of the nut to form a resilicut or spring flange 16, forming'a radial projection'on the nut and adapted to be slightlysprung by theaxialpressure of the nut 14.

r The latter is formed on its inner face with an annular marginalbearing surface or abutment 17, between which and the shaft 10 saidinner face of the nut 14. is dished or recessed at 18. The effect ofthis surface is to afford a hearing or abutment for the nut 14 againstthe flange portion 16 only of the nut 13, which gives a yieldingpressure between the nuts when they are screwed together and increasestheir frictional locking client with respect to each other. The nut 14is made sufficiently thin to be somewhat resilient, and a further elfectof the outer annular bearing between i the nuts is therefore to slightlydish or concave the outer nut and increase the bite or hold of the outerportions of its thread upon the threaded portion 12 of the shaft 10.This augments the locking action, and thewhole structure as thus fardescribed, without the addition of the locking-washer, hereinaftermentioned, affords an efficient nut-lock.

It will be observed that each nut has a portion which is resilientrelatively to another portion thereof. For instance, the flange 16 ofthe nut 13 is resilient relatively to the body of said nut, while theouter marginal bearingsurface 17 of the nut 1 1 is resilient or adaptedto yield relatively to the inner portion of said not which is adjacentto the Shaft or other supportlO. The portions of the two nuts whichengage each otherare therefore resili ent in an axial direction, thuspermitting the attainment of the advantages above set forth. To attainan additionally secure locking action, however, I interpose between thenuts 13 14 a thin locking-washer 19, made of soft flexible metal, suchas mild steel, and formed with a series of flexible lips or teeth 20 20,adapted to be easily bent into or out of. the plane of the washer 19.The nuts 13 14 are each formed, as here shown, with a series ofeightnotches 21 22, extending around their circumferences and locatedbetween teeth 23 24., said notches being adapted to receive a spannerfor turning the nuts and also constituting recesses into which theflexible lips 20 of the washer 19 may be bent, said lips 20 exactlyfitting the notches21 22. It is evident that by turning certain of thelips 20 of the washer 19 into the notches 21 of the nut 13 and others ofsaid lips into the number than the notches 21 22 in thetwo 10o nuts, andtheir number isa non-multiple of the number of the notches. Thus in theillustration there are twenty-two teeth 20 and eight notches 21 or 22,so that there can only be at most two teeth 20 engaged with each nut. Ifthe notches 21 22 of the two nuts are exactly in register, as showii inFig. 1, there can be only one tooth 20 in engagement with the nut 13 andone inv engagement with the nut 14. If, however, the notches of the nutsare out of register, as indicated in Fig.5,

there may be two flexible teeth in engagement with each nut. Thearrangement described allows for bringing a pair of notches of eithernut into register with a pair of teeth of the washer by a very slightrotation of said nut, for there will always be a pair of teeth at somepair of points in the circle in register, or very nearly so, with a pairof notches of the nut. This slight movement is the more readilypermitted (even though the nuts are jammed close together) by reasonofthe resiliency of the flange 16. The lockingwashers 19 are inexpensiveand if subjected to long use, so as to bend off their teeth, may bereplaced at small cost.

In assembling the device I preferably bend one of the teeth of thewasher 20 into one of the notches of nut 13 and then screw up the nut14. If the notches of the two nuts come into exact register, the othertooth of the pair is bent into an opposite notch'on 'nut 14, as shown inFig. 1, and if the notches do not come into register the second tooth ofthe pair is bent into the opposite notch of the nut 13 and a pair ofteeth bent into two notches of the nut 14.

1. A nut-lock comprising a support formed with screw-threads of oppositepitch, and coacting nuts thereon both of which are resilient in an axialdirection at their engaging portions, one of said nuts having a rigidface on the side away from the other nut.

2. A nut-look comprising a support formed with screw-threads of oppositepitch, and coacting nuts thereon one of which has a rigid body, and aradial marginal resilient flange on the side toward the other nut, saidother nut having its body or web resilient in an axial direction, theresilient portions of the nuts engaging each other.

3. A nut-lock comprising a support formed with screw-threads of oppositepitch, nuts thereon relatively resilient in an axial direction at theirengaging portions and formed with notched portions, and an interposedlocking-Washer having flexible locking portions adapted to coact withthe notched portions of the respective nuts.

4. A nut-lock comprising a support formed with screw-threads of oppositepitch, nuts thereon formed with notched portions and both havingresilient interengaging portions, and an interposed lockingwasher havingflexible teeth adapted to coact with the notched portions of therespective nuts.

In testimony whereof I have affixed my signature in presence of twowitnesses.

MAR-OELLUS REID.

Witnesses O. F. BROWN, A. D. HARRISON.

